Air-compressor pump.



B. M. RQGGENBUCK. AIR COMPRESSOR PUMP.

APPLICATION FILED NOV- 21, 1915.

' Patented. Jul 11, 1916.

3 SHEETS-SHEET .1; y is. 4 I ll A fl Z J0 J 7"4 5 m 9 9 1 V #15 B. M. ROGGENBUCK.

AIR COMPRESSOR PUMP.

APPLICATION FILED NOV-27.19l5- 6 1 9 1 L 1 y 1 u u d 9 t H 6 t a D1 3 SHEETSSHEET 2.

B. M. ROGGENBUCK." AIR COMPRESSOR PUMP. APPLICATION FILED NOV. 27,1915.

- 1,1 9&463. Patented July 11, 1916.

3 SHEETSSHEET 3.

1 Elm BERNARD M. ROGGENBUCK, 0F NORFOLK, VIRGINIA, ASSIGNOR OF ONE-HALF T0 JENNIE POWERS, OF NORFOLK, VIRGINIA.

AIR-COMPRESSOR PUMP.

Application filed November 27, 1915.

To all whom it may concern:

Be it known that I, BERNARD M. Rosean- BUCK, a citizen of the United States, residing at Norfolk, in the county of Norfolk and State of Virginia, have invented new and useful Improvements in Air-Compressor Pumps, of which the following is a specification.

This invention relates to improvements in air compressor pumps for air brake systems.

One object of the invention is to simplify and improve the construction of such compressors by providing a compressor in which all the various actions are controlled and governed by a single valve.

Another object is to provide an air compressor which admits of the application of new piston rings when occasion requires in a simple, ready and convenient manner.

The invention consists of the features of construction, combination and arrangement of parts herein fully described and claimed, reference being had to the accompanying drawings in which Figure 1 is a side elevation of an air compressor pump embodying my invention. Figs. 2 and 3 are vertical longitudinal sections of the same, showing the positions of the parts in refitting the respective pistons with new packing rings. Figs. 4 and 5 are similar views showing the positions of the parts in the working and reversing actions of the pump. Fig. 6 is a vertical section through the main valve and associated parts on an enlarged scale. Fig. 7 is a similar view of the casing of the primary trip lever and cooperating parts. Fig. 8 is a view in horizontal section through the main valve and main valve casing on line 88 of Fig. 6. Fig. 9 is a horizontal section through the main valve and valve casing on the line 99 of Fig. 6. Figs. 1O, 11 and 12 are elevational views of the main valve. Figs. 13 and 14. are detail vertical sections through the main valve casing. Figs. 15 and 16 are vertical sections on lines a-a and b4) of Fig. 9 looking in opposite directions and omitting the valve.

Referring to the drawings, 1 designates the steam cylinder and 2 the air cylinder of the pump, which are of ordinary form and construction, except as hereinafter described. The cylinder 1 is closed by detachable top and bottom heads 3 and 4, while the cylinder 2 is closed by detachable top and bottom Specification of Letters Patent.

Serial No. 63,779.

heads 5 and 6, the respective heads being secured in position by screws or like fastenings 7. The heads 4. and 5 are joined in the usual manner and the cylinders maintained in spaced relation by a neck 8 cast with said heads, and which is provided with the usual openings 9 therein and also with a cut away portion 10, for the purposes hereinafter described. The cylinder 1 has a steam inlet connection 11 and an exhaust steam connection 12, while the cylinder 2 is provided with an air inlet connection 13 and a compressed air discharge connection 14, the latter leadlng 1n practice to the main air reservoir.

Arranged to operate in the cylinders 1 and 2 are pistons 15 and 16, the rods 17 and 18 of which are connected for movement in unison and work through stufling boxes 19 and 20 upon the respective heads 4 and 5. It will be understood that in one direction of motion the piston 16 takes in air through the inlet 13 and in its opposite direction of motion compresses the air and discharges it through the outlet 14, the inlet and outlet connections being provided with suitable check valves. The pistons are provided as usual with packing rings 21, and one part of my invention relates to a novel relative arrangement of the piston and cylinders and construction and arrangement of the several parts whereby these piston rings may be readily and conveniently applied and renewed whenever occasion requires without dismantling the pump or removing the piston heads, as will be fully described hereinafter.

Another part of my invention relates to a novel construction of valve mechanism, ports, passages and reverse gearing, by which the use of valves or reversing gearing on the air cylinder-is dispensed with and whereby, through the use of but a single valve on the steam chest, the various operations of the pump are efliciently governed and controlled. As shown, the head 3 carries a valve cage or casing 22 closed by a detachable plug or head 23 and within which works the main or steam valve 24:, which is entirely automatic in action. This valve comprises a cylindrical body of less length than the depth of the valve casing and having at its lower end a tappet lug or projection 25 adapted to be engaged by the piston 15 to move the valve upwardly within the casing, the valve being adapted to drop by Patented July 11L, 1916.

gravity to a lowered position. Formed in the casing, at one side of the same, are main steam supply ports 2'6 and 27 and an exhaust port 28, which ports respectively connect with passages 29, 30, 31 leading, respectively, to the lower and upper ends of the cylinder 1 and to theexhaust connection 12, the ports 26 and 27 communicating respectively with the top and bottom of the j valve casing, while said casing is provided with a branch passage 26 connecting the up per end of said casing with the lower port '26, and with a branch port 27 connecting the lower end of said casing with the port 27 the ports 26 and 27 serving, together with the branches 26 and 27 both as steam supply and exhaust ports. At its side diametricallyopposite the ports 26, 27 and '28 the valve casing is provided with a steam supply port 29 communicating. with a passage 30 leading to theiconnection 11, and at said side the casing is also provided with aslot 31 and a threaded opening 32, Fig. 8.

The valve 24 is provided at its side facing the ports 26, 27 and 28, Fig. 15, with steam supply ports 33 and 34 for cooperation with the ports 26 and 27, and transverse grooves or channels 35 and 36 for cooperation with the port 28 and the said ports 26*:and'27 and their branches 26 and 27 The ports 33 and 34 form the diverging branches of a Y-shaped steam supply channel through the valve, the main stem or passage 37 of which is adapted for cooperation with the port 29"., The same side of the valve, through which the inlet end of the passage, 37 opens, is formed with grooves or recesses 38 and 39 to respectively receive a stop pin or screw 40 and one arm of an in termediately pivoted valve shifting lever 41, the said screw acting to limit the longitudinal and rotary movement of the valve, while the lever shifts the valve for a reversing action. a

The projection 25 extends through an opening in the head 3 within the top of the cylinder 1 and in the path of movement of the piston 15, while theother arm of the lever 41 projects into a chamber 42 formed on the side of the head 3 and valve casing 22-and which is closed bya detachable'head or cover 43. The said chamber'is adapted to receive the upper end of a reversing or valve shifting rod or bar 44 which is movable vertically in a suitable guide way 45 in or upon the cylinder 1 and is provided with a reduced stem or lower end 46 which projects downwardly through the head 4 and into a casing or chamber 47 'formed'integrallyhtherewith and closed by a detachable head or plate 48, which is wholly exposed through the cut away portion 10 of the neck 8. The said stem 46 lies in the path of motion of the outer end 49 of a trip lever 50 fulcrumed within the chamber 47 upon a pivot bolt or screw 51, the other end or arm of said trip lever being arranged to lie in the path of downward movement of a plunger or sliding trip pin 52 extending through the head 4 and adapted to be engaged and depressed by the piston 15 at the limit of the downward movement of said piston. The construction and arrangement is thus such that upward motion may be transmitted to the rod or bar 44 to operate the shifting lever 41 for the reversing action, and it will be noted that the parts 41, 44, 49 and 50 and 52 are adapted to maintain and return to a normal position by gravity, thus dispensing entirely with the use of governing springs.

Y The construction having thus been described, the operation of my improved air pump or compressor is as follows :Assuming that the valve and piston are at the limit of their downward movement, it will be seen that the steam inlet passage 37 will be connected by the steam supply passage in the valve with the port 26 and passage 29, the branch 26 also being in communication with the steam supply port. Steam will thus be supplied to the lower end of the cylinder 1 through the port 26 and passage 29 for the purpose of moving the piston 15 on its up stroke, steam being supplied at the same time to the top of'the valve casing 22 through the branch passage 26 to hold the valve 24 down during this movement of the piston. In this position of the valve it will be seen that the outer arm of the lever 41 will be raised, while the reversing rod 44 will be depressed. When the piston 15 reaches the limit of its upward movement it engages the lug 25 and shifts the valve 24 upwardly into a position in which the steam supply port in the valve communicates with the port 27, passage 30 and branch passage 27, by means of which the passages 26 and 26 will be blanked and steam supplied to the cylinder 1 above the piston to move the latter on its down stroke and also supply steam through the passage 27 to the bottom of the valve casing to hold the valve elevated and in proper position during such movement of the piston, the adjustment of the valve to the stated position having in the meantime connected the ports 26, 26 and 29 with the port 28 for the exhaust of the steam from the bottom of the steam cylinder and the top of the valve casing. As soon as the piston 15 reaches the limit of its downward movement it engages and depresses the slid- 7 ing trip rod or plunger 52 and thus locks the lever, the arm 49 of which will be elevated to lift the rod 44 which will transfer motion to the shifting lever 41 to positively move the valve 24 downward, for,a repetitionof the operation first described, the positive actuation of the valve by the piston on its reverse movements obviating any liability of the valve sticking and interfering with the regular, uniform and continuous operation of the pump under different atmospheric and other conditions. It will thus be seen that the use of reversing mechanism upon the air cylinder is dis pensed with and a construction provided by means of which the various operations of the pump or compressor are controlled by means of a single valve, thus insuring simplicity of construction, a material reduction in number of parts, and increased etficiency of action with less liability of derangement of the pump and decrease in cost of repairs, etc.

In practice, the relative arrangement of the piston heads is such that while each piston head has a full course of travel, the piston 15 is movable upwardly against the head on its upward motion, while the piston 16 terminates a distance of two or more inches in a standard type of pump from the head 5 at the limit of its upward motion, while on the downward motion the reverse is the case, the piston 15 stopping a distance above the head 4 at the limit of its downward movement, while the piston 16 moves clear down to the head 6. The purpose of this arrangement of the pistons is to enable said pistons to be supplied or refitted with packing rlngs in a ready and convenient manner, without dismantling the pump or requiring any material amount of time or labor on the part of the operator. If it should be necessary to refit the piston 15 with rings, the head 3 and casing 42 are detached, whereupon the pistons may be moved upward without disconnecting them and the piston 16 will be permitted to have a full range of travel so that the piston 15 when fully lifted Wlll project outward at the top of the cylinder 1 allowing the packing rings to be readily applied thereto. If, on the other hand, 1t is necessary to refit the piston 16 with pacle ing rings, the cap 48 and screw 51 are removed to permit the plunger 52 to be detached and the head 6 is removed, whereupon the piston 15 may have a full range of downward travel and the piston 16 will thus on its downward movement project below the open end of the cylinder 2, so that it may be readily and conveniently refitted with packing rings, as will be readily understood. The advantages of the invention will accordingly be rendered manifest and appreciated by those versed in the art without a further and extended description.

I claim An air compressor pump comprising a steam cylinder, an air cylinder, said cylinders being arranged in axial alinement and provided at their relatively outer ends with detachable heads, pistons operating in said cylinders, a rod connecting said pistons for movement in unison, said rod being of a length to space and so dispose the pistons within the respective cylinders that when the steam piston is at the limit of downward stroke it terminates above the lower head of the steam cylinder while the air piston moves downwardly into contact with the lower head of the air cylinder, and upon the reverse strokes of the pistons the air piston terminates below the upper head of the air cylinder while the steam piston moves up ward against the top head of the steam cylinder, for the purpose set forth, and valve mechanism controlling the supply and exhaust of steam to and from the ends of the steam cylinder.

In testimony whereof I affix my signature in presence of two witnesses.

BERNARD M. ROGGENBUCK.

Witnesses:

L. E. LEwIs, NELSON HoLMEs.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

